621320 Offices of Optometrists

Official definition

This industry comprises establishments of health practitioners having the degree of O.D. (Doctor of Optometry) primarily engaged in the independent practice of optometry. These practitioners examine, diagnose, treat, and manage diseases and disorders of the visual system, the eye, and associated structures as well as diagnose related systemic conditions. Offices of optometrists prescribe and/or provide eyeglasses, contact lenses, low vision aids, and vision therapy. They operate private or group practices in their own offices (e.g., centers, clinics) or in the facilities of others, such as hospitals or HMO medical centers, and may also provide the same services as opticians, such as selling and fitting prescription eyeglasses and contact lenses.

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

• Offices of opticians primarily engaged in selling and fitting prescription eyeglasses and contact lenses are classified in Industry 456130, Optical Goods Retailers.
• Offices of physicians primarily engaged in the independent practice of ophthalmology are classified in U.S. Industry 621111, Offices of Physicians (except Mental Health Specialists).

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 621320

The Census index assigns these 3 activities to this code. If your business matches one, this is your code.

• Doctors of optometry (ODs) offices (e.g., centers, clinics)
• ODs' (doctors of optometry) offices (e.g., centers, clinics)
• Optometrists' offices (e.g., centers, clinics)

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 621320

To count as a small business for SBA loans and federal contracts under NAICS 621320, your business (including affiliates) must not exceed $9 million in average annual receipts. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 8690), so treat them as a starting point and check the definition.

• 86900Other human health activitiesUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

• 621310Offices of Chiropractors
• 621330Offices of Mental Health Practitioners (except Physicians)
• 621340Offices of Physical, Occupational and Speech Therapists, and Audiologists